GCG may refer to:
- Biochemistry
- GCG, a codon for the amino acid alanine
- Gallocatechin gallate, a flavonol
- Proglucagon, a protein
- GCG (General Computer Group) was collection of programs for the analysis of gene and protein sequences, now defunct
- Medical
- Other
- Gallantry Cross, Gold of the Republic of Venda
- Geological Curators' Group, a UK charity promoting geology
- Global Church of God, a Sabbatarian church based in England
- Government College Gujranwala, in Pakistan
- The Grilled Cheese Grill, an American restaurant chain
- Guardian Capital Group, a Canadian financial services company
- Gwaun-Cae-Gurwen, a village in Neath Port Talbot, Wales
- Knight Grand Cross of the Royal Guelphic Order, a Hanoverian order of chivalry
This disambiguation page lists articles associated with the title GCG.
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